SOLUTION: Tim left Paris traveling 51 mph. Sally, to catch up, left sometime later driving 60 mph. Sally caught up after 4 hours. How long was Tim driving before Sally caught up?

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Question 913083: Tim left Paris traveling 51 mph. Sally, to catch up, left sometime later driving 60 mph. Sally caught up after 4 hours. How long was Tim driving before Sally caught up?
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!

Gaining speed 60 -51= 9 mph
Time to catch up 4 hours
Head start 9*4=36 miles
Algebraic solution
9*4=36 miles head start
60*4-51*4=9*4
36 is less than 51 so he drove less than an hour
51t=36
t=36/51 0.71 hours or about 42.35 minutes